Given data
*The given mass of the apple is m = 0.75 kg
*The given height is h = 3 m
*The value of the acceleration due to gravity is g = 9.8 m/s^2
The formula for the potential energy is given as

Substitute the known values in the above expression as

Hence, the potential energy of a 0.75 kg apple sitting 3 m off the ground is U_p = 22.05 J